TITANIUM MATERIAL AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2017/155072

A1

A titanium material 1 which comprises an inner layer part 3 and a surface layer part 2 that is bonded to the inner layer part 3, and wherein: the surface layer part 2 has a chemical composition containing, in mass%, 0.4% or less of O, 0.5% or less of Fe and 0.020% or less of Cl with the balance made up of Ti and impurities; and the inner layer part 3 has a chemical composition containing, in mass%, 0.4% or less of O, 0.5% or less of Fe and more than 0.020% but 0.60% or less of Cl with the balance made up of Ti and impurities. The inner layer part 3 has voids, and the area ratio of the voids in the inner layer part 3 in a cross-section of the titanium material 1, said cross-section being perpendicular to the longitudinal direction of the titanium material 1, is more than 0% but 30% or less. The Cl content (ClI) in the inner layer part 3, the thickness (tS) of the surface layer part 2 and the thickness (tI) of the inner layer part 3 satisfy (ClI ≤ 0.03 + 0.02 × tS/tI).

KITAURA TOMOYUKI (JP)
SHIRAI YOSHIHISA (JP)
FUJII HIDEKI (JP)

PCT/JP2017/009619

September 14, 2017

March 09, 2017

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NIPPON STEEL & SUMITOMO METAL CORP (JP)

B21B3/00; B21B1/02; C22B34/12; C22C14/00; C22F1/18; C22F1/00

WO2017018519A1

2017-02-02

US5564064A	1996-10-08
JPH02187282A	1990-07-23
JP2015045040A	2015-03-12

KIYOSHI SHIBATA ET AL.: "Mechanism and Mathematical Modeling for Chlorine Removal in Titanium Produced by Kroll Process", NIPPON STEEL TECHNICAL REPORT, vol. 375, November 2001 (2001-11-01), pages 33 - 37, XP009512436, ISSN: 0300-306X
See also references of EP 3427850A4

BRIGHTAS IP ATTORNEYS (JP)

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